Chrysler says it's not sure exactly how many will be recalled. The company says an outside force such as a driver's knee can knock switches out of the "run" position, shutting off the engine. This disables power-assisted steering and braking and the front air bags might not inflate.

Engineers are working on a fix. Chrysler says it knows of no injuries and only one accident. The company says only a few complaints have been filed. Owners should keep clearance between their knees and keys until repairs are made.

The recall comes as U.S. safety regulators investigate ignition switch problems across the auto industry.